- Refer to ADC Electrical
Characteristics for the values of Rin and
CS/H
- Refer to Digital IO Electrical
Characteristics for the value of CI
- Cpar and Rpar represent the parasitic capacitance and
resistance of the external ADC input circuitry
Use the following equations to solve for the minimum sampling time (T) required for
an ADC conversion:
- Tau = (Rpar + Rin) × CS/H + Rpar × (Cpar + CI)
- K= ln(2n/Settling error) – ln((Cpar +
CI)/CS/H)
- T (Min sampling time) = K × Tau